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Ipmsm / Pmsm


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In doing some research on this topic, I came upon these two papers which

I expect will be of benefit to those who are looking for an education on

IPMSM/PMSM motors ... and a drive system relevant thereto.


These papers are in PDF file format and are the Doctoral Thesis and Master Thesis

respectively submitted by their authors.





Development and Analysis of Interior Permanent Magnet

Synchronous Motor with Field Excitation Structure

by Seong Taek Lee

University of Tennessee - Knoxville, USA

Link: http://trace.tennessee.edu/cgi/viewcontent...magnet+motor%22


Throughout the years Hybrid Electric Vehicles (HEV) require an electric motor

which has high power density, high efficiency, and wide constant power operating region

as well as low manufacturing cost. For these purposes, a new Interior Permanent Magnet

Synchronous Motor (IPMSM) with brushless field excitation (BFE) is designed and

analyzed. This unique BFE structure is devised to control the amount of the air-gap flux

for the purpose of achieving higher torque by increasing the air-gap flux at low speed and

wider operating speed range by weakening the flux at high speed.

On the process of developing the new IPMSM, the following analysis results are

presented. Firstly, a new analytical method of output torque calculations for IPMSM is

shown. This method works well when using a 2-dimensional magnetic equivalent circuit

of a machine by omitting the step of calculating the inductance values which are required

for the calculation of the reluctance torque. Secondly, there is a research about the slanted

air-gap shape. This structure is intended to maximize the ratio of the back-emf of a

machine that is controllable by BFE as well as increase the output torque. The study of

various slanted air-gap shapes suggests a new method to increase torque density of

IPMSM. Lastly, the conventional two-axis IPMSM model is modified to include the

cross saturation effect by adding the cross-coupled inductance terms for calculating the

power factor and output torque in comparing different saturated conditions. The results

suggest that the effect of cross-coupled inductance is increase when d-axis current is high

on the negative direction."





by Enrique L. Carrillo Arroyo



Link: http://citeseerx.ist.psu.edu/viewdoc/downl...p1&type=pdf


The thesis deals with the detailed modeling of a permanent magnet synchronous

motor drive system in Simulink. Field oriented control is used for the operation of the drive.

The simulation includes all realistic components of the system. This enables the calculation

of currents and voltages in different parts of the inverter and motor under transient and steady

conditions. The losses in different parts are calculated, facilitating the design of the inverter.

A closed loop control system with a Proportional Integral (PI) controller in the

speed loop has been designed to operate in constant torque and flux weakening regions.

Implementation has been done in Simulink. A comparative study of hysteresis and Pulse

Width Modulation (PWM) control schemes associated with current controllers has been

made in terms of harmonic spectrum and total harmonic distortion. Simulation results are

given for two speeds of operation, one below rated and another above rated speed."

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